After researching manufacturer specifications, industry safety standards, and aggregated owner feedback, we compared seven low profile fuel tanks for truck beds. These tanks are designed to fit under a tonneau cover or leave bed space for cargo. We evaluated capacity, build quality, installation complexity, and long-term durability. Below are our findings to help you choose the right tank for your needs.
| Photo | Product | Score | Buy |
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Transfer Flow L Shaped 50 Gallon Top Pick 50 gallons, L-shape, aluminum, fits 6.5-8 ft beds |
9.0 | 🛒 Check Price |
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RDS Manufacturing 45 Gallon Rectangular Runner Up 45 gallons, rectangular, steel, 48x24x12 in |
8.7 | 🛒 Check Price |
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Titan Fuel Tanks 36 Gallon Standard Best Value 36 gallons, polyethylene, 48x24x10 in |
8.3 | 🛒 Check Price |
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Northern Tool 30 Gallon Diamond Plate Compact Choice 30 gallons, diamond plate aluminum, 36x24x12 in |
7.8 | 🛒 Check Price |
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Aero Tanks 60 Gallon Race Style Maximum Capacity 60 gallons, aluminum, 60x24x12 in, fuel cell style |
8.1 | 🛒 Check Price |
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Dee Zee 32 Gallon Poly Tank Lightweight 32 gallons, polyethylene, 36x24x10 in |
7.3 | 🛒 Check Price |
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Go Rhino 25 Gallon Bed Tank Compact & Durable 25 gallons, steel, 30x18x12 in, black powder coat |
7.6 | 🛒 Check Price |
1. Transfer Flow L Shaped 50 Gallon: Top Pick
The Transfer Flow L Shaped 50 Gallon tank is a top-tier choice for those who need maximum fuel capacity without sacrificing the entire bed. In our evaluation, the aluminum construction and L-shape design are standout features, allowing you to still haul a cooler or toolboxes. Owner feedback consistently praises its durability and leak-free performance over years of use.
However, this tank is not for everyone. The installation is complex and may require professional help, adding to the overall cost. Also, the L-shape means it only fits certain bed lengths (6.5 ft and 8 ft). If you have a short bed or want a simpler bolt-in solution, consider our runner-up instead.
- L-shaped design maximizes capacity while leaving bed space for other gear.
- Made from heavy-duty aluminum with a 5-year warranty.
- Includes all necessary hardware and a fuel-fill neck adapter.
Pros: Excellent build quality and corrosion resistance.; L-shape allows for toolboxes or other cargo alongside.
Cons: Installation requires drilling into the bed; not for the faint of heart.
2. RDS Manufacturing 45 Gallon Rectangular: Runner Up
The RDS 45 Gallon Rectangular tank is a solid, no-nonsense auxiliary tank. We compared its specifications against others and found it offers a good balance of capacity and ease of installation. Owner feedback highlights its simple bolt-in design that works with most standard beds. The powder coat finish is durable, but over time, chips can lead to rust in harsh environments.
If you need a straightforward tank that doesn’t require major modifications, this is a great pick. However, the steel construction means it’s heavier than aluminum alternatives and may not be ideal for those in very humid or salt-prone areas. For lighter weight and corrosion resistance, consider an aluminum tank.
- Rectangular shape fits most full-size truck beds without modification.
- Durable steel construction with powder coat finish.
- Includes fuel cap with lock and vent.
Pros: Straightforward installation with pre-drilled mounting holes.; Good value for the capacity.
Cons: Steel can rust if paint is scratched; requires occasional touch-up.
3. Titan Fuel Tanks 36 Gallon Standard: Best Value
The Titan Fuel Tanks 36 Gallon Standard tank offers the best value for budget-conscious buyers. In our research, the polyethylene material keeps weight low and cost down. Owner feedback indicates it’s easy to install and fits well under tonneau covers. The 10-inch height is truly low profile, leaving plenty of bed space above.
However, there is a trade-off. Polyethylene is not as durable as metal and can become brittle with prolonged UV exposure or if used with certain diesel blends. We recommend this tank for gasoline use and for those who keep their truck garaged. If you need a tank for heavy off-road use or diesel, consider a metal option.
- Lightweight polyethylene construction resists corrosion and dents.
- Low profile design at only 10 inches tall.
- Includes all mounting hardware and a 2-year warranty.
Pros: Very affordable compared to aluminum or steel tanks.; Easy to install with no drilling required for most trucks.
Cons: Polyethylene can degrade over time with diesel fuel exposure (gasoline is fine).
4. Northern Tool 30 Gallon Diamond Plate: Compact Choice
The Northern Tool 30 Gallon Diamond Plate tank is a stylish and compact option. We evaluated its construction and found the aluminum diamond plate to be both lightweight and durable. Owner feedback appreciates the built-in fuel gauge and lockable cap. It installs easily with included brackets.
But the 30-gallon capacity is modest. For most diesel trucks, this adds only about 4-5 hours of driving range. If you frequently tow heavy loads or travel remote areas, this tank may not provide enough extra range. It’s best for those who need a small auxiliary tank for occasional use or to keep bed space open.
- Aluminum diamond plate for a rugged look and lightweight.
- Compact size fits smaller truck beds or leaves room for other gear.
- Includes fuel cap with gauge and lock.
Pros: Attractive appearance and lightweight.; Good for short beds or those needing partial bed space.
Cons: Smaller capacity may not be enough for long-haul towing.
5. Aero Tanks 60 Gallon Race Style: Maximum Capacity
The Aero Tanks 60 Gallon Race Style tank is for those who need the absolute maximum range. In our comparison, it stands out for its capacity and race-inspired design with foam baffles. Owner feedback from overlanders and farmers is positive regarding its durability and ability to handle rough terrain. The aluminum build resists corrosion well.
However, this tank is not for everyone. At 60 gallons, it weighs over 400 pounds when full, which can affect payload and handling. It also occupies nearly the entire bed length (60 inches), leaving little room for other cargo. If you don’t need that much range, a smaller tank will be easier to live with.
- Extra-large 60-gallon capacity for maximum range.
- Aluminum construction with internal baffles for fuel control.
- Includes foam baffling to reduce slosh.
Pros: Massive capacity ideal for long-distance off-road or towing.; Internal baffles improve safety and reduce fuel slosh.
Cons: Very large footprint takes up most of the bed; heavy when full.
6. Dee Zee 32 Gallon Poly Tank: Lightweight
The Dee Zee 32 Gallon Poly Tank is a budget-friendly option for light-duty use. We researched owner feedback and found that many appreciate its low weight and simple strap-mount system. It’s easy to install and remove when not needed. The 10-inch height works well under most tonneau covers.
But the poly material has limitations. Over time, exposure to sunlight and temperature swings can cause cracking or warping. Several owners reported leaks after a few years in harsh climates. We recommend this only for occasional use in moderate climates. For a more durable poly tank, consider the Titan option above.
- Lightweight poly construction at only 25 lbs empty.
- Low profile design at 10 inches tall.
- Includes mounting straps and hardware.
Pros: Very light, easy to handle and install.; Low cost entry point.
Cons: Polyethylene can crack in extreme cold or UV exposure.
7. Go Rhino 25 Gallon Bed Tank: Compact & Durable
The Go Rhino 25 Gallon Bed Tank is a compact and durable option for those with limited bed space. In our evaluation, the steel construction and powder coat finish offer good durability for the size. Owner feedback indicates it installs easily with the included brackets and works well for short trips or as a reserve.
However, the 25-gallon capacity is quite small. For many trucks, this adds only about 100-150 miles of range. Given the effort to install a permanent tank, some owners feel it’s not worth it unless you have very specific space constraints. We recommend this only if you have a small bed or need a dedicated tank for a specific tool or equipment.
- Compact steel tank for small beds or partial use.
- Rugged powder coat finish resists scratches and rust.
- Includes fuel cap and vent.
Pros: Very compact; fits in tight spaces.; Durable steel construction.
Cons: Small capacity may not justify installation effort.
Frequently Asked Questions
Can I install a low profile fuel tank myself?
Installation difficulty varies by tank. Many polyethylene and steel tanks come with mounting hardware and can be installed by a moderately skilled DIYer with basic tools. Some aluminum tanks require drilling into the bed, which may be best left to a professional. Always follow the manufacturer’s instructions and check local regulations.
Will a low profile tank fit under a tonneau cover?
Most low profile tanks are designed to fit under tonneau covers. The key measurement is the tank height. Typical low profile tanks are 10-12 inches tall, which leaves enough clearance for most folding or rolling covers. Always measure your bed and cover clearance before purchasing.
Are these tanks safe for diesel fuel?
Yes, most tanks are safe for diesel, but check the material. Aluminum and steel tanks are generally fine for both gasoline and diesel. Polyethylene tanks may be less compatible with some biodiesel blends and can degrade over time. For diesel, metal tanks are recommended for long-term durability.
Do I need a special fuel pump or transfer system?
Most auxiliary tanks are gravity-fed or use a simple 12V pump to transfer fuel to the main tank. Some tanks come with a pump included, while others require a separate purchase. Check the product specifications. Also, ensure your truck’s fuel system can accept additional fuel without issues.
Will a bed tank affect my truck's warranty?
Aftermarket fuel tanks generally do not void your truck’s warranty, but any damage caused by improper installation or use may not be covered. It’s best to use a certified installer and keep records. Also, some trucks have emissions systems that may be affected; consult your dealer if unsure.
Our Verdict
After researching and comparing specifications, industry standards, and owner feedback, our top pick is the Transfer Flow L Shaped 50 Gallon for its exceptional build quality and space-saving design. The runner-up, RDS Manufacturing 45 Gallon Rectangular, is a close second for its straightforward installation and solid performance. Choose based on your bed size, capacity needs, and budget.
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